#light p:hover {
    color: darkgoldenrod;
}

#box2 {
    height: 300px;
    background-image: url(http://www.yiliao.com/course_bg.jpg);
}

#box3 img {
    position: relative;
    left: 460px;
    top: 20px;
    width: 130px;
    height: 130px;
    border-radius: 65px;
}

.str {
    list-style: none;
    border: 1px solid wheat;
    padding: 5px;
    width: 1000px;
    font-size: 14px;
    line-height: 180%;
    padding: 10px 20px 10px 20px;
    margin: 0px 150px;
}

table {
    margin: 0px 400px;
    font-size: 14px;
}

.str>p {
    text-indent: 2em;
    color: black;
    font-size: 18px;
    margin: 10px 0px;
    /* z-index: 200; */
}